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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d094f6feeee8918f620a0e91ca8cb9ff39da88f5f9e9226f36ceeaa5a21571' 
  AND token = 'LRkLOlctFh9vs5cPSmB1vzSNNJxPjaC6Kc3htoYQmbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}